This is a slimy technique that involves deceiving a woman into touching a man's genitals without her knowledge or consent. The 'popcorn trick' is an example of this.

"So anyway," said Lisa "i was at the movies and i felt something tap me on the shoulder. When i turned my head to investigate, i realised that a man had tapped me on the shoulder with his boner, which then made contact with my mouth as i turned my face".
"Sounds like you copped The 'Ferro'" replied Tom.